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https://github.com/featurebasedb/featurebase.git
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284f62dcb9
* create function, create/drop model; re-introduced limit; added COPY; var(); corr() * review feedback
104 lines
2.7 KiB
Go
104 lines
2.7 KiB
Go
// Copyright 2023 Molecula Corp. All rights reserved.
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package planner
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import (
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"context"
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"fmt"
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"github.com/featurebasedb/featurebase/v3/sql3"
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"github.com/featurebasedb/featurebase/v3/sql3/planner/types"
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)
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// PlanOpCreateFunction implements the CREATE FUNCTION operator
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type PlanOpCreateFunction struct {
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planner *ExecutionPlanner
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function *functionSystemObject
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ifNotExists bool
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warnings []string
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}
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func NewPlanOpCreateFunction(planner *ExecutionPlanner, ifNotExists bool, function *functionSystemObject) *PlanOpCreateFunction {
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return &PlanOpCreateFunction{
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planner: planner,
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function: function,
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ifNotExists: ifNotExists,
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warnings: make([]string, 0),
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}
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}
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func (p *PlanOpCreateFunction) Schema() types.Schema {
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return types.Schema{}
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}
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func (p *PlanOpCreateFunction) Iterator(ctx context.Context, row types.Row) (types.RowIterator, error) {
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return newCreateFunctionIter(p.planner, p.ifNotExists, p.function), nil
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}
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func (p *PlanOpCreateFunction) Children() []types.PlanOperator {
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return []types.PlanOperator{}
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}
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func (p *PlanOpCreateFunction) WithChildren(children ...types.PlanOperator) (types.PlanOperator, error) {
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if len(children) != 0 {
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return nil, sql3.NewErrInternalf("unexpected number of children '%d'", len(children))
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}
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return NewPlanOpCreateFunction(p.planner, p.ifNotExists, p.function), nil
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}
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func (p *PlanOpCreateFunction) Plan() map[string]interface{} {
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result := make(map[string]interface{})
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result["_op"] = fmt.Sprintf("%T", p)
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result["_schema"] = p.Schema().Plan()
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result["model"] = p.function.name
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return result
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}
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func (p *PlanOpCreateFunction) String() string {
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return ""
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}
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func (p *PlanOpCreateFunction) AddWarning(warning string) {
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p.warnings = append(p.warnings, warning)
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}
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func (p *PlanOpCreateFunction) Warnings() []string {
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var w []string
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w = append(w, p.warnings...)
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return w
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}
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type createFunctionIter struct {
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planner *ExecutionPlanner
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function *functionSystemObject
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ifNotExists bool
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}
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func newCreateFunctionIter(planner *ExecutionPlanner, ifNotExists bool, function *functionSystemObject) *createFunctionIter {
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return &createFunctionIter{
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planner: planner,
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function: function,
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ifNotExists: ifNotExists,
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}
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}
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func (i *createFunctionIter) Next(ctx context.Context) (types.Row, error) {
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// now check in the functions table to see if it is exists
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v, err := i.planner.getFunctionByName(i.function.name)
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if err != nil {
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return nil, err
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}
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if v != nil {
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if i.ifNotExists {
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return nil, types.ErrNoMoreRows
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}
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return nil, sql3.NewErrViewExists(0, 0, i.function.name)
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}
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// now store the view into fb_functions
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err = i.planner.insertFunction(i.function)
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if err != nil {
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return nil, err
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}
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return nil, types.ErrNoMoreRows
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}
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